CLAS physics database search results Measurement E159M858 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Stat. error deg mcb/rad mcb/rad 9 0.879517 0.217555 27 1.16552 0.216028 45 1.0464 0.178297 63 1.18401 0.193521 81 1.12523 0.180961 99 0.997606 0.162479 117 0.943565 0.181314 135 0.911137 0.179027 153 0.722214 0.164963 171 0.477551 0.144523